Deliberate mistake: The elevator operated by gremlins starts ascending at around 5 stories per second, based on the floor readings. Yet when the elevator suddenly stops dead, Kate does not fly into the air caused by the huge speed change. (00:50:05)
Gremlins 2: The New Batch (1990)
1 deliberate mistake - chronological order
Directed by: Joe Dante
Starring: Christopher Lee, John Glover, Robert Prosky, Phoebe Cates, Zach Galligan, Robert Picardo
Revealing mistake: The Gremlin who throws the beaker full of acid has his arm operated by a stick, which is visible as he chucks the beaker. (01:08:05)
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Trivia: When that insane gremlin has Billy sitting in a dentist chair and is attacking him with the dentist tool, at some point he asks, "Is it safe?", for many it must have seemed senseless, but it is actually a nod to the 1976 movie "Marathon man", in which, during a scene, Dustin Hoffman is sitting on a dentist chair while tortured with a dentist tool by an ex- Nazi (played majestically by Sir Laurence Olivier) who keeps asking him the same question once and again.
Answer: He wasn't relevant to the plot.
Rob245