The only characters who appear in all four Nerds films, played by the same actors each time, are Lewis Skolnick, Mr. Skolnick, Dudley "Booger" Dawson, and Lamar Latrelle.
Originally presented on the FOX television network in 3-D and AeromaVision, as a promotional item Fox distributed a series scratch and sniff cards to be sniffed at certain points in the movie
Although he is not onscreen at the time, Booger can be heard at the bridal shower yelling, "Hey, Takashi! What happened to Gilbert?" This is a brief reference to Louis's best friend from the other films in the series.
At Booger's bachelor party, the spy camera is permanently fixed inside a statue, and is stationary. Later, when Jeanie's father shows the video to his family, the shots are panned, when they should have been stationary like the camera was.