The van of Krazy-8 (Max Arciniega) has Tampico furniture written on it. This is the same company he told Walt (Bryan Cranston) about in season 1 of Breaking Bad (2008).
This episode marks the earliest chronological appearances of Domingo Molina (Max Arciniega) aka Krazy-8 and Lawson (Jim Beaver), who first appeared in Breaking Bad (2008).
Lawson (Jim Beaver) is the arms dealer from whom Walter White (Bryan Cranston) purchases a Ruger LCR revolver (Thirty-Eight Snub (2011)) and M60 machine gun (Live Free or Die (2012)) in Breaking Bad (2008).
When Jimmy (Bob Odenkirk) goes to see Chuck (Michael McKean), Chuck is wearing a wristwatch. This appears to be an old-fashioned analog wristwatch, consistent with Chuck's fear of all things electronic or electrical.