In Robbie's room, there is a clearly displayed poster for the "Teenage Mutant Ninja Cavemen". This is a double reference, as not only was this show running while the TMNT craze was white-hot, but the Jim Henson company worked on the first two Ninja Turtles movies. Many of the Ninja Turtle suit actors even worked as various Dinosaur suit actors for the series
The calander on Robbie's door counts the days backwards.
Two small scenes were removed during syndication on Disney Channel in the late 90s/early 00s.
Robbie's full name is Robert Mark Sinclair.