The opening credits of Emergency!
From_a_to_z, you’re right about 25 and 26. 
Unanswered:
22. *Damn Yankees, * with Ray Walston.
24. Extreme Makeover, Home Edition.
30. Mighty Mouse. 
Ten more:
31. A newsreel item shows a body, in a coffin, being carried out of a house–a former wife of a famous athlete.
32. A British soldier shuffles cards and invites an onlooker to play.
33. A woman with a hideously twisted face looks into her hand mirror–satisfied.
34. A scene in the Enterprisewith this dialogue:
Spock–“We’re about to be swallowed by a giant sheepdog!”
Kirk-- “For God’s sake, I hope he’s been wormed!”
35. A younger man and his wife see an older man and woman, and another younger man, coming across the street–and almost literally barricade themselves inside.
36. A mother pig is removed from her piglets in a stockyard, and a milking machine replaces her. 
37. Inside an elevator shaft, the rollers of an elevator car approach a planted supply of explosives–suspensefully slow.
38. As a man in a bizarre machine looks on, the flesh on a dead monster’s head decomposes and eyes fall out of the sockets–then the bones start to moulder away…
39. In a courtroom, a judge pushes piles of mail (on the bench) out of his way–and makes his ruling in the case before the bar.
40. An irritated man picks up a hidden camera and slams it down on another man’s head!
The Cook, The Thief, His Wife, and Her Lover.
Just kidding.
Sunset Boulevard.
There’s Something About Mary?
I want to say “Eye of the Beholder” from The Twilight Zone, based on your description, but it’s been many years since I saw that.
I don’t have the slightest idea, but I can’t wait to find out. It sounds creepy!
The Time Machine? Please don’t ask me which version.
Tin Cup?
God help me, I know this:
34 – Zapped! I showed this dreram sequence (and no other part of the film) at one of my Bad Film Festivals
37 – The Guns of Navarone, of course.
#38 is indeed from The Time Machine. The 1960 Rod Taylor/George Pal version.
- Norma Jean?
- Miracle on 34th Street
No to both that answered. Setting the scene a little more…it’s out in the desert and he’s hitting from off the top of a trailer. I’ll give the answer if it’s not finished today.
Hogan’s Heroes (opening credits)
That’s not from Speed is it?
NDP 4 through 9 have all been correctly answered. (However regarding NDP 8, I believe it was George C. Scott’s character who was drinking the milk.)
A few more:
NDP 10 - A man makes a peanut butter sandwich for his daughter only to be told by her that she’s allergic to peanuts; and
NDP 11 - Two men take a ride in a ferris wheel.
You got it - and without the clue, too.
Anyone care to try for the other two? More clues added:
**VP1: **An Associate Professor checks the sun to determine the time (at a summer camp).
**VP2: **The dinner guest, a detective, looks puzzled at his tumbler of wine (which his partner just handed him).
Wet Hot American Summer?
Yay, we have a winner!
Some more hints for those of mine still unanswered:
DY1. The artist’s use of the color blue sells the painting.
Later, a boy claims his half-brother stole his pencil.
DY2. There’s an unidentifiable war in a unidentifiable forest.
Later, a man first imagines himself as a general, then as a fish.
DY3. The radio tells us the cows need to be gotten into the barn.
Earlier, we learn that pink and gold were her favorite colors.
The Shining
DM-37: The Guns of Navarone?
That’s right.
And now the common theme should be evident.
The Third Man
RT4: Tomorrow Never Dies Michelle Yoeh to Pierce Brosnan
JT3: Pretty Woman
NDP5: Dick Tracy
A2: Swordfish Hugh Jackman and Halle Berry
Brazil?
Babe