When Jax and Tara are talking after the proposal they zoom out to show Tara holding a blonde baby. When Jax walked into the room prior to the proposal the baby had much darker hair.
In June Wedding (2010), Clay said that the club needed at least four members to remain whole, making it important to make Kozik a full member before most of them go to prison. Because Tig refused to vote Kozik in, the club would have been left with only three members and should not have been able to do any official business, including voting in a new member.
While Jax and Tara are talking on the bed after he has proposed, the crew can be heard moving around the room - especially the dolly grip who is pushing the camera closer.