In the introduction, John says "Look up, Byeee". An increase in hum is heard just before this as the faders open. On mono versions, just before the band start, there is more talking, including what sounds like John saying "People City" just after the cluck.
0:10-0:15
Someone says "Sorry, What?, This one?" on the bass drum beats. Followed by a half awake "Haah?" from Lennon. Paul sings something high pitched, sounds like "Pussy cat".
1:15-1:17
After Paul's "Wooo", John says "Paul, could you hold my guitar for me". Also Paul heard really going mad singing. On mono versions this is heard better, "We'll be back" or "We're the band, the greatest band of all time", and a faint "Sergeant Peppers BAND!", finishing on the final chord