19Svetlana and Carol's Overlong Pregnancies
It's easy to calculate their pregnancies being about 10 - 12 months long.
Two pregnancies on Shameless fudged the laws of nature in a quite obvious way. In season 3, both Isidora Goreshter's Svetlana and Vanessa Bell Calloway's Carol (V's mom) found out that they were with child. However, neither of them actually gave birth until early inseason 4. The break between season
3 and season 4 is about 2 to 3 months within the show's timeline.
Of course, only the most devoted fans would be able to see that there was a mistake made here. And, at the end of the day, it didn't really matter as both pregnancies were important to the story in different ways.