In the department store, they start with a double-speaker Toshiba "boom-box". When Sam is apprehended by the store's new "owner", he directs his henchman to "turn off the music" (sic). The boom-box is now a single-speaker, generic tape player/radio when he shoots it.
Near the buffet table at the party scene in front of Samatha's and Regi's house, there are hundreds of people in the whole area watching the comet. But after the comet leaves, there are perhaps not even fifteen pieces of clothing remaining from all the disintegrated people there.
When the initial scene in the projection booth begins, we see a steel shipping reel running at the top of the projector. In all other shots after that one (presumably within the same 20-minute running time of a 2000' 35mm film reel) the reel changes from the steel shipping reel to a cast aluminum house reel.
Danny Mason Kenner aka DMK: [Danny stops next to Samantha after he almost hit her with his Mercedes convertible]
Gawd, I'm sorry but you shouldn't cross against the light like that. Hey, you guys are survivors too, huh?