Audio problem: Rita is dubbed over extremely poorly - her words don't match her mouth. This is because Power Rangers is adapted from the Japanese Super Sentai series, and the footage of Rita was from the Japanese series.
Audio problem: Just before Dorothy has her operation, Mike is seated at her desk looking through her medical books. Sully pays a visit to comfort her. During their moment, you can hear slight foot shuffling from the camera crew in the foreground - which is not coming from the outside. Also, you hear a slight grunting during a pause in their conversation.
Audio problem: In the park where Bobby is face to face with Chickiebutt and his Acme Mega-Beak, Bobby says, "He's wearing the Acme Mega-Beak over here" but his mouth makes no movement as he talks.
Santa's Little Helper - S1-E10
Audio problem: When Amy is playing the piano with Morgan, the last few notes that they play while the camera is focused on them are out of sync. (00:19:50)