All of Lyndsy Fonseca (Penny) and David Henrie's (Luke) scenes as Ted's future children were filmed during the first season to keep them the same age throughout the series.
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Things You Didn't Know About HIMYM
FanfictionHere are some mind-blowing facts that you probably didn't know about the show How I Met Your Mother.
1)
All of Lyndsy Fonseca (Penny) and David Henrie's (Luke) scenes as Ted's future children were filmed during the first season to keep them the same age throughout the series.