The sequence with the Mutant Enemy mascot, the little monster that goes "Grr Argh" at the end of all episodes, was changed for a total of six episodes: in "Becoming Part Two" (#2.22) it said, 'Oh, I need a hug." in "Amends" (#3.10) it wore a Santa hat and bells were jingling. in "Graduation Day Part Two" (#3.22) it wore a graduation cap. in "Once More With Feeling" (#6.07) it sang its "Grr Argh." in "Storyteller" (#7.16) it sang, "We are as gods." in "Chosen" (#7.22) it looked out at the viewers instead of looking straight-forward.
During seasons 6 and 7, the ones that took place on the UPN network, the final shot of the opening credits shows Sarah Michelle Gellar, as in all the previous seasons. The difference is that rather than those images being that of Buffy, they were of facsimiles of the Buffy character. For the majority of Season 6 the final image of the opening credits was of the Buffy Bot shortly before Glory ripped its head off and Season 7's image was of the First Evil, pretending to be Buffy while manipulating Spike. For some fans this plays to the idea that Buffy was somehow not the same after having been resurrected at the beginning of Season 6 through the end of the series run.
For the three first season 6 (the first UPN season) episodes (Bargaining parts 1 and 2, and Afterlife), the ending credits had almost 3/4 parts of the screen occupied by the Buffy logo (as seen on the opening with the moon behind), and the credits appearing under it. This was later returned to the normal black screen with the credits.
Season 4 final credits include this disclaimer: "UC Sunnydale" is a fictitious university. Any similarity to an actual university is purely coincidental. No representations, warranties, or characterizations of any type regarding any actual university including any named "UC Sunnydale" or "University of California at Sunnydale" are intended and none should be inferred.