It always bugged me that Geordi, not Data, is the one that noticed the out-of-place Romulan. I mean Data should have spotted that right off the bat given his abilities but nope, Geordi walks right into in and asks Data about it (and then gets zapped).

TNG RewatchTimescapemaybe he just wanted to see if Geordi would spot itLike a spot the differences pictures - Data's already found all the discrepancies and wants to see how many his friends get