Spock Prime is behind the new timeline (or whatever you prefer to call it). So, him being there is not 'jarring' other than his movement to the past being 'jarring' to the timeline.
As it is the same general universe, why would the presence of a tribble be a problem? McCoy's personality, and therefore manners of speech, would likely be similar as well.
If anything, seeing Stewart, Brooks or Mulgrew as a different character would have a far greater effect of taking you 'out of the movie' than the things you cited. Seeing Mulgrew in character in Nemesis
was bad enough!