On Rt. 118, it lists one of the trainers in RS as Sailor Barny when he's really a Fisherman.
Also, there doesn't appear to be any trainer or item data for Abandoned Ship.
Small tidbit, but there is a 2nd comet shard found in Dragonspiral tower on BW2. on floor 7F needing the dowsing machine. (There is one on 6F too which is listed)
I don't know if this has been mentioned before but, the Sinnoh mentions that Kanto ( and logically Johto also ) are to the South of Sinnoh. But, Sinnoh is shown to the south of Kanto/Johto in pokearth.
It may have been a while since I played but I can tell you, Walt with two Magmars is not a Bug Catcher, he is a Firebreather:
I also don't think Bird Keeper Vance had a Level 8 Pidgeot on Pokemon Crystal, perhaps it was Level 38 like his other one?
In Kalos, in Glittering Cave: Missing entry for Woobat in "shaking area" in 1F. I ran into one at level 17.
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GRS: Sawsbuck, Pansage, Quilladin