So, I was on youtube and came across the zip-a-dee-doo-dah lyrics from Song of the South. I was listening and heard a familiar noise, it was the park entrance noise whistle! Listen for yourself!
The whistle is a few seconds after 1:55 of the video. It is so cool that they used the whistle from that! I am proud for finding that lol. I was just sharing with you guys to see if you guys knew about it. I didn't know until just today after I listened to this song.