During Becky's inner voice monologue, she says it's her choice to sound like the Queen of England. Helen Mirren, Becky's inner voice, won the Best Actress Oscar for playing Queen Elizabeth II in The Queen (2006).
The kiss that Finn gives Rachel during Without You was not scripted. Finn was supposed to just give Rachel a hug but Corey Monteith changed it.
During the song Wedding Bell Blues, the hats that Sue and Beiste are wearing mimic two of the hats worn at the Royal Wedding.