Audio problem: When Gordon backing down to the bottom of the hill, you can hear brakes screeching, but Gordon's wheels are still moving.
The Sad Story of Henry - S1-E3
Audio problem: When James is about to puff away from Henry's Tunnel, if you listen closely, James is heard puffing before he has even left. (00:10:00)
Audio problem: In some American home video releases, when Thomas climbs Gordon's Hill, the music and sound effects are briefly muted and a voice says, "Look out for the train." The voice can still be heard in some other releases, but the music and sound effects are not muted.
Audio problem: When Sir Topham Hatt goes "Mmmmmmm..." if you listen closely, you'll hear Ringo Starr's lip smacking in the background very faintly. This goof is only visible in the American version of the episode. (00:03:00)
Audio problem: When Sir Topham Hatt, the policeman, and Thomas' crew are at Elsbridge Station, Thomas whistles, but his crew is standing on the platform.
Thomas' Christmas Party - S1-E26
Audio problem: (Only in the George Carlin narrated American version) At the end of the episode, when the engines are singing "We wish you a merry Christmas", you can briefly hear Ringo Starr's original narration.
Audio problem: Edward has Thomas' whistle sound when he first sees Trevor and when he approaches Wellsworth Station.
The Runaway - S2-E10
Audio problem: When Thomas is tired and approaching the station, he is moving pretty slow, but the sound of Thomas' wheels moving is like he's going pretty fast.
Thomas and Percy's Christmas Adventure - S3-E26
Audio problem: When this episode was re-narrated in the US, it was changed to an episode about Thanksgiving. This caused a scene to get cut, which messed up the dubbing track, making half of the episode out of sync. (00:03:00)
Audio problem: Gordon had Duck's whistle sound and James had a different whistle sound in almost every Season 4 episode they appeared in.
Audio problem: In the US version (Rusty Helps Peter Sam), Peter Sam has a different whistle sound after the trucks hit him. And throughout the episode, a lot of music and sound effects are missing.
Audio problem: Thomas has James' whistle sound when he passes Sir Handel at the beginning.
Audio problem: Stepney's whistle sound changes throughout the entire episode. And in the UK and other versions (excluding US), Gordon, Duck, and Douglas have the same whistle sound.
Bowled Out - S4-E18
Audio problem: When James leaves Crovan's Gate, he has Smudger's whistle sound.
Bye George - S5-E7
Audio problem: Gordon has Duck's whistle sound before he crashes into the truck.
Audio problem: Mavis has Derek's horn sound.
Audio problem: When Arthur arrives at the lake, he has Spencer's whistle.
Audio problem: Douglas has Donald's whistle sound when he passes Murdoch.
Audio problem: When Oliver arrives at the station, he has Percy's whistle sound.
Answer: Breakdown trains help the engines back on track.