How did Kara get an invitation to Barry’s wedding, anyway? Did Cisco just vibe it onto a table in Kara’s apartment? Did Barry personally hand deliver it? I don’t think the USPS on Earth-1 has a breach to Earth-38 just yet. 
Presumably Cisco vibed it into her mailbox. Or the DEO offices.
When Thawne sneered at Barry about his not knowing what face he (Thawne) would wear next, I imagined this scenario: Thawne captures Iris (or another loved one of Barry’s), and then it turns out he accidentally kidnapped J’onn.
“You’ll wonder, too,” replies Barry, yoinking the killer’s eyes out at superspeed.
No love for Harry telling Kara to take UberGirl “up . . . up and away” with just enough different emphasis to not make it totally obvious? (just finished watching this last night).
I’d like to have seen a quick cut to DeVoe, who’d have been sedately monitoring stuff while putting together his latest prediction, suddenly pausing in mid-sentence to tilt his head to the side and blurt out that he didn’t see this coming and has absolutely no idea who these people are or what the heck is going on.
That was absolutely perfect.
I kinda want to see a cross over between Legends and Vikings, just to see Sara hang out with Lagaretha and Mick going aviking with the boys.