One completely inconsequential thing that grated on me was how the 10 era ended with Leon-BB saying, "This house has never belonged to Big Brother, or even the Housemates. It is 
your House."
And then the first thing 7-era BB does is call it "my house" and get into an argument with Angela about how it's his house, not hers. 

 (And I'm still pissed at ITV for trying to copy that voice and 
intro. 

)
--
Seeing as Leon had literally the last word of the 10 era ("
Thatisall... for now..."), I wonder if they'll give him the first word this time.
[the lights slowly flicker to life in the Diary Room]
"Theeeuuuss... isBigBrother. 
Uhstralia. I 
told you I'd get back to you..." [cue titles]