Continuity mistake: In "The Luminous Fish Effect" (S1E04) Sheldon tells Penny he weighs 140 pounds. In "The Porkchop Indeterminacy" (S1E16), he tells his sister he weighs 165. 25lbs difference would be a noticeable change, but he looks the same.
MFWills
12th Nov 2015
The Big Bang Theory (2007)
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Suggested correction: Lying to Penny but not to his sister, not inconsistent with the characters and his relationships.