In Disenchantment, King Zøg yells “Bite my shiny metal axe!” as he runs into battle, pretty obviously referencing Bender’s catch phrase from Futurama. Both characters are voiced by John DiMaggio.
Another one, from the same Sopranos episode: Dr. Melfi’s (played by Lorraine Bracco) ex-husband tells her that people’s opinions of Italian-Americans are based on Goodfellas. Bracco played Henry Hill’s wife Karen in that movie.
In an episode of Murdoch Mysteries (The Death of Dr. Ogden) the janitor, played by Rainbow Sun Francks, is a sort of Will Hunting character for a Mensa-like group, who solves difficult puzzles, tells Constable Crabtree “no one gets paid to solve puzzles” – kind of a dig at the theme of the series and the detective work Murdoch does, but Francks was also a regular as the computer nerd in the series The Listener, which involved a lot of police detective work.
A friend of mine had a university professor who would offhandedly use that phrase when he was late to class. “Sorry to keep you waiting, but…”
If that wasn’t scripted, then it’s brilliant.
There’s a two-part Hercules episode like that, where the actor who plays Hercules is missing, and the action takes place among the writers and producers of the show-- but they are all played by regular actors from either Hercules or Xena.
It’s very funny.
In John Waters’ Female Trouble, Edith Massey plays Ida, the aunt of Divine’s character’s husband and her antagonist. At one point in the film, she is kidnapped and put in a human-sized bird cage. She complains to Divine’s daughter Taffy, played by Mink Stole, that she is starving. “We don’t have any food here. Mother doesn’t buy food for me. You want an egg? There might be an old egg in there.” Ida then yells “No, I don’t want no goddamn eggs! I want meat and potatoes.” Edith Massey, of course, was notorious for having played Edy the Egg Lady in Waters’ previous film Pink Flamingos who was obsessed with eggs.
That would be actor Kevin Sorbo.
After Hercules: The Legendary Journeys he did SciFi show Andromeda (influenced by Star Trek) and in one episode he opens a secret panel…
Inside it he finds a Hercules style broadsword and a lock of long hair - In Hercules Sorbo had much longer hair than he had in Andromeda. Holding the items briefly Sorbo quips “It’s a long story…”
Here is the scene:
TCMF-2L
I’ve seen Dick Van Dyke refer to his famous trip over the ottoman from the old Dick Van Dyke show twice.
In Diagnosis Murder, he tells his on screen and off screen son that he nearly tripped over an ottoman when at a crime scene.
In The Middle, Jerry Van Dyke tells the Hecks that they should move an ottoman because Dick’s character would probably trip over it.
Another from Arrested Development (which has recently been my quarantine binge)…
Scott Baio is introduced as “Bob Loblaw”, the lawyer replacing “Barry Zuckercorn”, played by Henry Winkler. He says it “isn’t the first time he’d been brought in to replace Barry” and that he could “do anything Barry could do but skew younger”. As someone who watched far too much Happy Days in my childhood, I giggled. 
In The Big Bang Theory, Sheldon and Amy put lists of possible Halloween couples costumes on a white board. One entry on Amy’s side was Blossom and Joey.
On Everybody Loves Raymond, in a Halloween episode Peter Boyle wore a Frankenstein costume. He had famously played the monster in Young Frankenstein.
And in a Halloween episode of “Freaks and Geeks,” Joe Flaherty wore a vampire costume - an nod to his performance as Count Floyd on “SCTV.”
Last night on The Goldbergs Adam and his Gramps were watching the movie Cocoon. Adam’s chemistry teacher whipped up a bunch of placebo so Adam could give Gramps an extra shot of youthfulness. The chemistry teacher was Steve Gutenberg, who was in Cocoon. The closing credits gave a shoutout to Gutenberg in both roles.
In Star Trek: The Next Generation, Data is learning how to be funny with hologram Joe Piccopo. They are doing Jerry Lewis-esque bits onstage together but there’s one point where Data sounds just like Bob Wheeler from Night Court.
The movie Clue has one that I’m not sure was intentional, but…
When the motorist (who turns out to be Colonel Mustard’s driver during the war) comes to the door during the night while it’s raining, and the door is opened by Wadsworth (played by Tim Curry), it plays like a nod to The Rocky Horror Picture Show. The motorist even says “Sorry to interrupt your party, but my car broke down a couple of miles up the road – could I use your telephone?”
George Raft of course became a star playing tough gangsters in the 1930s. In Johnny Allegro (1949), he’s a florist/decorated war hero/escaped convict who’s recruited by the US government for an undercover mission.*
When he meets the man behind a big counterfeiting scheme, following exchange takes place:
Morgan Vallin: And how did that minute mind of yours conclude that anyone could be of service to me with his pictures in all the papers, with a number across the front of them?
Johnny Allegro: They took those a long time ago. I’ve changed a lot since then.
Morgan Vallin: But your type never changes. Just looking at you makes one think of alley fighting, tommy guns.
Johnny Allegro: Is that bad?
*And if you can believe all this, I have swampland in Florida you might be interested in.
Early in Crazy Heart, Jeff Bridges’ country-singer character plays a gig at a bowling alley. When he sits down at the bar afterwards, the shot looks almost identical to Bridges’ final scene as “The Dude” in The Big Lebowski.
I don’t know if it fits this thread exactly or not since it is an overt reference to a previous role, but William Shatner, plays himself and makes references to his role as T.J. Hooker in the movie Showtime with Eddie Murphy and Robert De Niro, which ends with him jumping onto and bouncing of off the hood of a car.
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