I followed the link to R5-D4's wiki and what the hell is this?

There is a continuity error in Episode IV, involving R5-D4. Just after the red droid's motivator has blown, C-3PO puts a good word in for R2. For a second, we are shown R2, with R5 inexplicably replaced beside him. The next shot shows the Jawas running over to retrieve the droid from where he stands (correctly) next to Luke and Threepio. The explanation for this is that the act of sabotage by R2 was edited out of later versions of the film, the "continuity error clip" was shown seconds before the act as R2 looks around to see if anyone is watching him. This scene was in versions of the film shown at U.K. Cannon Cinemas (Sheffield) in 1978.[source?]

No source... just another faulty memory like the grappling hook?