Colin O' Donoghue has been promoted to and has been added to the main cast instead of guest starring cast since he started appearing in 2.05 with this episode for the rest of the series. He name appears after Emilie de Ravin and before Jared S. Gilmore.
When Emma, Henry and Rumple go look for his son they go to his apartment and figure out it is apartment 407. The number 815 is important in the show from the time Emma comes to Storybrooke to the apartment number of adult Henry. 407 is half of 815 which could be symbolic of the relationship between Neal and Rumple.
When Emma and Neal are drinking in the bar, the camera pans up to the word Cocktail and the number 23, which is one of the significant numbers from the TV show Lost.