The Snow at the game is clearly fake and only covers a small area of the field. When the camera turns to look the other way the background is green.
Sometimes Samantha's eye are blue, but usually they are green.
In the NFL, if your contract is up, the team can force you to stay by tagging you as a franchise player, then they could trade you. So Jake could still be traded even though his contract has expired.
When Lindy is in the kitchen you can clearly see a calendar in the background open to February.
When Jake and Samantha are making snow angels, their entire backs, head to toe, are lying in the snow. Immediately after they are done and Jake pulls Samantha to stand up it shows her from behind. There is not a flake of snow on her, even her wool hat, which would be coated in snow in reality. There is only a quick shot of him from that angle, but he has no snow on him either.