Admission officers already kind of expect that an applicant's spring schedule can be flexible and can depend on a plethora of variables. Changing your courses for spring/winter after you submitted TAG shouldn't have any penalty as long as the change doesn't prevent you from meeting the TAG requirements.
It was a while ago, but I'm fairly certain that I changed my spring schedule dramatically between the TAG app and the final winter update. I think I listed something like 4-5 classes for spring and I ended up taking two, none of the ones I dropped being need TAG, and I was still admitted to UCSD. Granted though, my major was impacted so I don't think I was admitted based on TAG; however, I'm pretty confident that it wouldn't have any affect on your admission decision. Call the admission office of the UC you TAGed for clarification though.