eine kleine nachtmusik im museum

Just in case you didn't catch this- in the very first scene introducing Larry Daley (Ben Stiller) to the night life in the museum, a tyrannosaurus-rex exhibit mysteriously goes missing.

If you listen carefully to the accompanying soundtrack, you can hear composer Alan Silvestri's tribute to John Williams, as he uses the theme from Jurassic Park's "Dennis Steals the Embryo" to highlight Daley's confusion as to whom might have pinched the exhibit.