Holly + Arroz
In what cannot be a coincidence, El Camino gives us a close-up shot of where Todd's apartment building is located not once, but twice. He's at the corner of Holly Avenue and Arroz Road. There's a Holly in Breaking Bad: Walter's daughter, but if you translate arroz into English, you get "rice," which takes you even one step further into Gilligan's world: Todd lives at Holly and Rice, which is a tribute to Holly Rice, Gilligan's his longtime partner, whom he references in all of his projects.
During Jesse and Todd's extended weekend together, Todd makes it clear that he wants to reward Jesse for doing a good job in helping him with a few pesky tasks -- like burying Todd's cleaner. So he offers to buy Jesse a pizza, a big one, and asks what kind he likes. Jesse responds that he likes pepperoni. It would be hard for any Breaking Bad fan to forget the ginormous pizza that Walt brought home for Skyler and the family... then promptly threw onto the roof.
Whether this one is an intentional Easter egg or just a happy casting coincidence isn't quite clear. But if Clarence, the gigantic bodyguard who escorted an SUV full of prostitutes to the Kandy Welding guys looks familiar, that's because he has made a couple of appearances as a henchman for Saul Goodman in Better Call Saul -- though on Saul he's credited as "Man Mountain."