Once-ler: Whoa, whoa, whoa! You wouldn't hit a woman.
The Lorax: Hoo! That's a woman?
When Ted visits the Once-ler for the second time and dives to the ground to avoid being launched by the sledgehammer as happened the first time, he stands up and his goggles are around his neck but hanging behind him. The scene then switches to the Once-ler and then back to Ted, and his goggles are still around his neck but now hanging in front of him.
When Ted opens a drawer looking for a nail for the Once-ler, a Minion figurine (from Despicable Me) is shown in the drawer.