National Lampoons Chistmas Vacation - Full Bloom in the Winter
When Clark is hanging up the Christmas lights and he gets caught between the ladder and the tree, notice the trees in the background, they are in full bloom, yet it is the dead of winter.
The pine trees indeed keep their needles all year round, but as other trees don't DIE, they shed their leaves during the cold weather months, the slip-up is that of these so-called leaf losing trees are still shown with their leaves in the dead of winter.
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