Baby See, Baby Do: When Five says that One is first, One copies, "First!", then when Five says that Two is second, he replies, "Second!".
Buffy Speak: The Numberjacks call bubble-blowing solution "bubble stuff".
Character Tics: The neighbour man with the clothes problems keeps putting his hands on his hips.
Contrived Coincidence: One and Two just happen to arrive in the control room when they're needed.
Fingore: A man hits his thumb with a hammer, but he experiences the pain first.
Hypocrite: Due to Three's Buddy Blocks causing her to miss them by jumping in excitement, she gets it into her head that "excited = bad" and tells Six not to get excited, but then admits to being excited herself.
Merlin Sickness: Discussed when Spooky considers making people into grownups before they're children.
Non-Nude Bathing: Five imagines a boy getting into the bath before taking his clothes off.
Signature Laugh: Lampshaded when Six says that he recognises Spooky Spoon's laugh.