How I Met Your Mother

As Fast As She Can - S4-E23

Revealing mistake: When Lily walks into MacLaren's at the end, you can see her pregnant belly bump due to Alyson Hannigan being pregnant during filming. Lily was not pregnant at any time during this season. Even if she did try to cover it up with her coat, the belly bump is still visible. (00:20:25)

Casual Person

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