The 1st film's ending goes double when 1. Gizmo says good bye to Billy. 2. The Old Man, despite indignantly lecturing the family over their negligence, assesses that maybe Billy can appreciate Gizmo.
Mr Wing: Perhaps one day you will be ready. Until then, Mogwai will be waiting.
A behind-the-scenes example for the second film. Leonard Maltin was recently a guest on the radio show Stus Show, and talked about how before the first Gremlins film he and Joe Dante were good friends, but then after Dante made the first film, Maltin was put in an awkward situation, because he needed to review it, and Maltin didn't really like the film much, despite everyone else liking it. He tried to get someone else to review the film, but that didn't work out, so Maltin reviewed the film himself, and unfortunately gave the film less-than favorable comments. Dante was a bit hurt by Maltin's statements, especially since at that time he had considered Gremlinshis best film. This lead to a falling out between the two for a number of years. Then comes the sequel, Dante actually called Maltin up and told him about a scene idea featuring Maltin as a film reviewer criticizing the first movie, and then getting attacked. Maltin was unsure at first (in part because he doesn't like acting in films or TV shows, and isn't a fan of the Leno Device trope), but he accepted. During filming, Dante told Maltin he could ad-lib his own dialogue, which Maltin did. After filming, the two reconciled, and have remained friends since.