When Jax (Charlie Hunnam) and Opie (Ryan Hurst) meet with Tig (Kim Coates) and Bobby (Mark Boone Junior) at the fundraiser, there is a man in the background who can be seen wearing a t-shirt that says "Free Big Otto", a reference to Otto (Kurt Sutter) being in prison.
First appearance of the character Chuck. Chuck is one of only two recurring characters to appear in every season, the other being Marcus Alvarez.
As the gang are on their way to get the stashed money from the Chinese restaurant, Half-Sack is seen wearing a Captain America t-shirt. Then later in the same scene, Lin turns up with his men to confront the SOA. Lin is played by Kenneth Choi who was part of Steve Rogers crew in Captain America: The First Avenger (2011).
The knuckle head was made up to 1947. In 1948 Harley replaced it with the pan head.