Once-ler: So you want to know what happened to the trees? I didn't think anybody still cared!
Ted: Well, that's me! The guy who still cares!
In the opening credits song an O'Hare worker does the splits on top of the O'Hare car. The shot then moves to the crowd and he is no longer there, but when it cuts back to the car he is on top of it again.
When Ted opens a drawer looking for a nail for the Once-ler, a Minion figurine (from Despicable Me) is shown in the drawer.