Continuity mistake: The high building behind the Mega Meaty Meat is revealed to be the Source's mothership when the facade peels away. But in later scenes it still has the facade on, still looking like the tall building from before.
Plot hole: When Beast Boy hires at Meaty Meat, he takes away the ad "Human Help Wanted" from the window right next to the door, and when the Titans come by for a meal later on, the sign remains gone. But as the Nufu ship reveals itself and the restaurant clients panic, the sign is suddenly back in the same corner of the window, even though it is unlikely that the Nufu Source/Bob would take in more hired help and risk being discovered all too soon.
Chosen answer: In recent years, the comics introduced Cyborg as a member of the Justice League. This was after his many years as a Teen Titan. In the rebooted DC Universe (known as the New 52) Cyborg is a founding member of the Justice League, and was never a part of the Teen Titans.
MasterOfAll