Stop the Hate Master (1) - S3-E12
Continuity mistake: Bulk has stepped on Skull's hand. We see a close-up of Bulk's foot on Skull's hand. When we cut to a wide shot of Bulk and Skull, Bulk's foot is no longer on Skull's hand, yet Skull is still squirming like his hand is trapped - as evident by Skull pulling his hand to get it free, and holding it when Bulk walks away.
Master Vile and the Metallic Armor (2) - S3-E29
Continuity mistake: Pink Ranger is suppose to be in Lord Zedd's palace, but after Yellow Ranger says "hope Kat and Tommy are all right" she can be seen in the back.
Master Vile and the Metallic Armor (1) - S3-E28
Continuity mistake: When the Rangers are riding horses Billy's shirt changes from a dark blue tank top to a blue striped T-shirt and back.
Answer: According to the IMDB, there are currently 10 different series (with an 11th premiering in 2006). And, as far as I can tell, there have been only two theatrically released movies. All of the series, with the exception of the first one (that premiered back in '93) are spin-offs of the original, and they all share similar plot lines, characters, etc.
Cubs Fan ★