Continuity mistake: When Frank sees what he thinks is the Ghost of Christmas Future in the elevator, he flips out and accidentally clocks Grace in the jaw. She puts her right hand to her face, but in the next shot she's holding her left hand up.
Continuity mistake: After Claire hits Frank in the head with the door, she kneels down to help him up, and she has no purse. In the next shot she has a brown purse in plain sight on her left shoulder.
Continuity mistake: Near the end of the film before Frank starts singing, watch the guy to his left (screen right) in the plaid shirt. He goes from being next to him to behind him and jumps around a few times in the scene.
Continuity mistake: On Claire's business card it says she works at Operation Reach Out, but the sign on the building says Operation Outreach.
Continuity mistake: When Elliot shoots at Frank, he hits a wreath hanging on the wall, and it bursts into flames and falls to the floor. Later when it's laying on the floor however, it has what looks like ashes on the floor around it, but the wreath itself is still perfectly green and not burned at all.
Continuity mistake: In the scene where Bill's old boss comes back to see him notice when Bill shoots him and takes the drink. All of the drink comes out of his chest because of the bullet holes. Well notice his shirt is all wet, then in the next scene when he takes off his hat his chest is all dry.
Continuity mistake: After the Ghost of Christmas Present slaps Frank, his tie gets flipped up over his shoulder. It then alternates being over his shoulder and down on his chest in successive shots.
Continuity mistake: At the end, Frank sees one of the dancers standing under the mistletoe. It cuts to a closeup of the mistletoe which is hanging still. But when it cuts back to the wide shot, the dancer's big hat is hitting the mistletoe, and it's moving around.
Continuity mistake: When the cab is about to crash against the two guys unloading parcels, the guys stare in awe and throw the parcels up in the air. Shot cuts to the cab skidding and the guys are back to calmly unloading parcels and repeating the previous movements.
Continuity mistake: When Frank steps in the cab the doorman disappears in the immediate angle from the inside.
Continuity mistake: The Ghost of Christmas Present introduces herself to Frank Cross by grabbing his tie while floating. When she comes down to earth, she's not holding it.
Continuity mistake: In the meeting when they show the advertisement for IBC's Scrooge, the Mary Lou Retton scene used in the commercial is the exact same shot that takes place before the live production of Scrooge days later. It shows Alfre Woodard and her son watching Mary Lou as she flips, which cannot be possible because it took place in the future. (00:04:00 - 01:12:00)
Answer: They are blowing a 'raspberry' on his bare belly, just good-natured teasing of a younger sibling.
Brian Katcher