PLOT HOLE - you could drive a truck through...

The tag being there doesn't really push the plot forward so much as it's just a little thing she notices... This is more of a nitpick/goof.

Using fake subject lines is considered TROLLING and poor netiquette
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It's called a continuity error. Happens in the best of movies, sometimes a lot, as eagle-eyed viewers know. Maybe the tag was inside his shirt when first seen, then he put it on for another scene and left it out -- itchy (also funnier). I don't know, haven't seen the movie.

Hey, after wasting everyone's time here, you might not want to hear this, but I just watched that scene again in slow motion and single-frame advance, and they never actually show the back of the neck of the shirt when he takes it out of the shopping bag. In fact, they are very careful not to show it.

The initial shot of the shirt is from the side, not showing enough of the back to notice any tag. Then he holds the shirt up in front of himself, with the front showing--not the back. So there's no continuity issue here. They probably bought the shirt at a store, and after the film was finished, they probably either gave it away or sent it to the wardrobe dept. to be used in the future. In fact, they could actually have returned it to the store, since the label was never removed.

So either you're not very observant, or you have a poor memory, or you're just a troll.

It is better to be kind than to be clever or good looking. -- Derek

The tag was underneath the collar. It slowly worked itself free. You can spot it partially revealed while the two are interacting, well before she spots it fully revealed.

Plot hole denied.

I have to throw the OP a bone here. This is old and he probabaly wont see it but since it has been resurected a few times... I would like to say I noticed it too and you can call it whatever you want. It is not that important.

Poor guy had to defend himself over something so trivial.