Continuity mistake: After Mae-Eye is banished back into the pie, the Titans assemble around it to ponder its fate. In the shots where we can only see their feet, they are positioned (clockwise, starting at 1 o'clock): Beast Boy, Starfire, Robin, Cyborg, Raven (who takes Silkie's place). But when we see their faces from the ground up, their positions are (taking the new perspective into account): Beast Boy, Robin, Starfire, Cyborg, Raven - on the whole meaning that Robin and Starfire switch places from one cut to the other, and back again.
Continuity mistake: Cyborg joins the Robin cosplay cadre, and in the garage we see him providing airflow for Beast Boy's cycle number. Look at Cyborg's right hand: first the wrist is colored green, the same as Robin's glove on his other hand, meaning that he must be wearing such on his right hand - which would be impossible without having it shredded by his hand-turned-fan. When Cyborg changes his hand back, he is not wearing a glove, but when he tries to take his turn on Robin's bike, he is suddenly wearing gloves on both hands.
Plot hole: After the Titans have recovered their senses, they engage Mae-Eye and her gingerbread men. Just before Cyborg and Raven are trapped in giant jars, they blast Mother Mae-Eye directly from behind. But for her to enchant them, she just turns to her left and casts her spell to her side instead of behind her.