"Man is in the forest" was a code phrase used by Disney's employees when Walt Disney was coming down the hallway.
Unusual for the time, Walt Disney insisted on children providing the voices for the animals when they were young, instead of using adults mimicking youngsters.
No matter how skilled the animator, the Disney cartoonists simply could not draw Bambi's father's antlers accurately. This was because of the very complicated perspectives required. To get around the problem, a plaster cast was made of some real antlers which was then filmed at all angles. This footage was then rotoscoped onto animation cels.
Six-year-old Peter Behn auditioned with several other children for the voice roles of Mother Rabbit's children. When Behn said the line (in reference to Bambi), "Did the young prince fall down?", a casting director who was watching the audition in another room shouted, "Get that kid out of here! He can't act!" However, the Disney animators who heard the audition tape loved the sound of Behn's voice. Behn was called back to the studio, and the character of Thumper was created largely based on his vocal performance.