The Fabulous Faker Boy - S24-E20
Other mistake: When Zhenya says "Boris" while showing Bart the scales, she presses the A key instead of the B key. (00:10:00)
The Fabulous Faker Boy - S24-E20
Continuity mistake: When Marge is talking to Bart, in the shot of Marge, there's a tree in the backyard, in another shot of Marge after the one with Bart and Lisa, the tree is gone.
Revealing mistake: When Reverend Lovejoy arrives at church in the hot tub, there are two Carls right next to each other in the crowd.
A Test Before Trying - S24-E10
Continuity mistake: During the electricity rate hike announcement, Chief Wiggum is seen in the crowd incorrectly drawn with brown skin and black hair.
The Day the Earth Stood Cool - S24-E7
Audio problem: When Homer says "Can I man hug you?", he mouths "Can I brother hug you?"
Answer: I'm not sure if this is the one you're thinking of, but an episode of "Ray Bradbury Theatre," called "A Sound of Thunder," dealt with a similar matter: a group of hunters travel back in time to hunt dinosaurs, only to find things have changed when they get back because someone stepped on a butterfly.
Xofer