*Episode 26 was originally meant to take place in Hiun City, which would originally be mentioned in the title too. There's no doubt the city was originally namedropped a couple times, all of which were edited out.
*The scene at the end, with Bel leaving, is new. Originally she was meant to stay with the group, which is why she's suddenly part of it out of nowhere with no explanation when BW27 starts.
In addition to those changes, there are a couple continuity hiccups caused by the moving.
*At the beginning of the episode, Satoshi asks Dent how much further it is to Raimon, and he pulls out a map that clearly shows the group as being in Hiun, at the south end of the desert, and Raimon at the north end. The dialogue here was obviously changed, this clearly being a scene where Satoshi was originally meant to learn about the next gym's location (in BW27 he just magically knows where he's headed), though no one thought of/bothered to redraw the map.
*Everyone are somewhat surprised to see Kojiro's Deathmas, since he caught in in BW25 and this is the first time they see it. In the moved episode, thy've seen it a dozen times already, so the implied surprise, dexing, etc makes little sense.
*Everyone are surprised to learn that Dent is a fishing expert. Though in the "new continuity", they already know that from BW35.
*The episode presents the Rockets' jetpacks as something new and cool. In the "new" continuity, we've seen them 7(?) times already, making this scene kinda out of place.
That's most of the points, I guess. The episode works in its current position, but there are a bunch of issues ith it that makes it feel it's not actually supposed to be there.