Continuity mistake: As Stripe bites at Pete, Pete jumps back. A second later, he jumps back again.
Continuity mistake: When Gizmo goes to Rand for protection, he's upright as Rand's hand comes around to comfort him. A second later, he's in a reclined position, with Rand scratching his stomach.
Continuity mistake: As Billy opens the box, Gizmo pops up and goes back down. When the angle changes, Gizmo is starting to go down again.
Deliberate mistake: At the bar many of the gremlins are drinking beer and getting wet from it but nothing happens.
Revealing mistake: Gizmo flies off a snow shovel on his car and it blows up. There is a noticeable edit here where the effect happens. It's likely the car didn't blow on the first take so they spliced two scenes together.
Other mistake: One of the evil Gremlins is messing with a stoplight by shorting out wires. The result is a very bright spark. Bright light is supposed to have a negative effect on the Gremlins - when we see them hit by the headlight beams in the bar they scream.
Chosen answer: The precise cut-off point is never stated - I've generally assumed that the embargo on feeding finishes once the sun comes up.
Tailkinker ★