Man on Porch: Why don't you kiss her instead of talking her to death?
George Bailey: You want me to kiss her, huh?
Man on Porch: Ah, youth is wasted on the wrong people.
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Continuity: In a scene early on in the film, where George Bailey (James Stewart), Bert (Ward Bond) and Ernie (Frank Faylen) chat in the street, they suddenly stop due to the appearance of Violet (Gloria Grahame) in her "this is what I wear when I don't care how I look" dress. The camera cuts back to them and we see a dark haired woman in a hat pass in front of Ernie's taxi. As Violet crosses the street, we see another shot of the boys staring after her - and the dark haired woman passes in front of the taxi again.
Visible crew/equipment: When Mary leans across the drugstore counter to whisper in George's bad ear, there is a small piece of tape on the edge of the counter right in front of her hand, presumably to show the actors where to position themselves for the shot (the tape isn't visible in the other shots showing that same section of the counter).
Continuity: When Ernie is about to take George during his "never born" sequence, if you look at the building next to the taxi, there is the Indian Club. As Ernie is driving along around 20-30 seconds pass inside the cab. When we see outside the cab and Ernie signals to the policeman, you can see the cab has only traveled roughly 20 meters from the Indian Club.
Continuity: During a confrontation between old man Potter and Peter Bailey at the Building and Loan, Potter's bodyguard stands behind the wheelchair on its left side. But in the close-up shot of Potter, the arms and hands of his bodyguard can be seen extending from the right side of the wheelchair. In the next full screen shot, the bodyguard is seen on the left side of the wheelchair once again.
Character mistake: Harry Bailey's tombstone has the dates of 1911 and 1919 making him 7-8 years old when he died, but the angel states that Harry died when he was 9 years old. If he was born the latest at 31-12-11 and died 31-12-19 he would have been exactly 8 years. If he was born 1-1-11 and died 13-12-19 he would have been 8 years 364 days, one day short of 9. If he was born later than the day of the year he died he would have been 7+.
Other: During Harry's party, when George is outside talking to his mother she encourages him to see Mary and George says "Point me in the right direction." He then exits right and immediately returns. As he passes by, there is a glitch in the film and for a brief moment everything speeds up. This is most evident if you watch the people dancing in the house because they appear as though they clicked into "fast-forward motion" briefly and then return to normal.