Simpsons, The Easter Egg - Ambulance Still There

At the end of Simpons movie after Homer is riding the motorcycle down the glass dome and ricocheting off the glass shards, he jumps springfield gorge and lands on the other side. There is a smashed ambulance there.

If you remember in Season Season 2 Episode 21 of the simpons series, bart decides to jump Springfield gorge with his skateboard but instead Homer did it. At the end of that episode, the ambulance taking homer away crashes into the tree and homer rolls back into the gorge.