From Wikipedia on GREMLINS 2: THE NEW BATCH
"Leonard Maltin, movie critic for Entertainment Tonight, had given a negative review to the first Gremlins film. While Dante was initially hurt by the review, he invited Maltin to film a cameo as the movie critic of a fictional Clamp Cable Network show, The Movie Police. Maltin gives a snide review for the video re-release of the first film along the lines of his original review before being assaulted by gremlins, pleading, "I was just kidding! It's a ten! A ten!"