The Aunt of the Once-ler says "Shake That Bottom Line" in one scene.

1 use of "damn", 1 use of "idiot" and a use of "stupid".

The Once-Ler's bed is put in a river while he's sleeping in it - an intense scene follows depicting the Once-Ler in a very dangerous situation, culminating in him almost falling down a waterfall, which may be frightening to some viewers.

The Once-Ler almost dies after being thrown from a waterfall to a nearby bank. While the resulting scene with the Lorax giving him CPR is mainly handled comically, it may be confusing to some younger viewers who are not familiar with the first aid concept, and also may be unsettling to watch due to its slight tension and the urgency of the situation.

There's a musical scene where the Once-Ler is portrayed as a giant man destroying the forest and scaring the animals away. This scene is slightly bizarre, and may frighten small children, as the music is also loud and strange.

The Once-ler aggressively yells at the Lorax while driving him backwards down a staircase.