Two references: a knob (matching the staircase knob in George Bailey's home) comes loose in Ray's hand, and Uncle Billy (from the film) bursts in looking for $8000 in a rolled up newspaper.
Spencer's squirrel camera from iCarly and Gibby's head were seen being held by Henry in the opening scene at Junk 'n' Stuff. Additionally, Charlotte's duck mask seems to be the one that Mandy Valdez from iCarly used.