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 (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.
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.
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 ★