A Tummy Ache and a Whale of a Metaphor - S2-E12
Continuity mistake: When Sheldon comes round from his op, the way he holds his cup, and the way the straw faces, changes between shots. (00:09:30)
A Nuclear Reactor and a Boy Called Lovey - S2-E13
Continuity mistake: When George is talking to Veronica at the lockers, there is an extra behind him who is constantly appearing and disappearing at the lockers behind him. (00:02:00)
A Nuclear Reactor and a Boy Called Lovey - S2-E13
Continuity mistake: When Georgie is writing a letter to Veronica, the handwriting changes drastically from when we first see it to when we see it a few seconds later. Note Veronica's name. (00:10:30)
A Math Emergency and Perky Palms - S2-E15
Continuity mistake: When talking to Mr Gilford, his arm is constantly on or off his walking stick, depending on the shots. (00:12:10)
A Broom Closet and Satan's Monopoly Board - S3-E2
Continuity mistake: George invites Mary out to dinner on Friday. But while they are at dinner, Sheldon is attending his college class (with Dr. Linkletter) - which meets on Thursday.
Answer: It's as simple as money is tight, it's not "George's money", it's the family's money so the expenditure was selfish.
MovieFan612