Trivia: There's a hidden Mickey on the 'MEGADORK' poster in Sid's room - the Mickey tattoo on the musician's arm.
Super Grover
Trivia: When Buzz & Woody are on RC, it very briefly shows Andy's little sister in the car, watching them from the mirror. In the background, we can hear "Hakuna Matata" from Disney's "The Lion King" playing on the radio. (01:12:05)
moviedude345Trivia: The sound the globe makes when rolling towards Buzz is the exact same noise as the boulder that rolls toward Indiana Jones in Raiders of the Lost Ark. (00:27:10)
Trivia: In Andy's room, when Buzz Lightyear tries to prove to everyone that he can fly, he bounces off the ball (red star/blue stripe) from Pixar's first film, Luxo Jr. [src]
Super Grover Trivia: The moving company, "Eggman Movers", is named after art director Ralph Eggleston. (01:08:30)
Trivia: When Woody accidentally wakes up Sid's dog, its growl is that of the T. Rex from Jurassic Park.
Trivia: One of the books on Andy's bookshelf is "Smyrl, Smyrl, Twist and Twirl". This is a reference to Eliot Smryl on the modeling team.
Trivia: While Buzz and Woody are at the gas station, after Buzz tells Woody of Emperor Zurg's secret weapon being built, when Buzz says, "Farewell" to Woody, Buzz raises his hand and does something similar to the Vulcan salute from Star Trek.
Super Grover 
Answer: Baby face taps RR TOYS COME OUT. Telling the other toys to come out from hiding. Pixar stated this in their Toy Story character overview.