Continuity mistake: Anthea falls backwards and lands next to the steps. When the shot changes she has moved 5 metres ahead. (01:23:00)
Continuity mistake: When Anthea is launched backwards, she lands sideways with both arms next to each other. A shot later, she is slightly facing down, with her body hiding her right arm.
Continuity mistake: When Kalypso and Hespera watch the horizon on the rooftop, Anthea walks towards them and stands behind Kalypso. Shot changes, and she's metres away, walking towards Kalypso again. (01:21:51)
Continuity mistake: After Freddie and Anthea kiss, his hand is around her neck. Shot cuts and his hand is away.
Continuity mistake: Shazam says, "Maybe Pedro sucks at dodgeball," with his left arm lowered next to the armrest. A shot later, his arm is raised and bent.
Continuity mistake: When Mary reads the Book of Powers, there's a close-up where one can see another book right next to the one she's reading. A shot later, that book is further away.
Continuity mistake: When Mary reads all the powers there are, she places her right hand on a page on the right. An instant shot later, it's on the opposite page.
Continuity mistake: When Mary is in the lair sitting on the floor, in the angle shot from behind her cape lies messily. On the frontal angle it lies neatly.
Continuity mistake: Shazam lifts up Hespera and smashes her unconscious against the floor. When she lands, her arms point downwards in a 4 and 8 o'clock position. A shot later, they're pointing upwards and are V-shaped.
Continuity mistake: Shazam dives Hespera in a hole underground. Then she kicks his ass and he falls backwards. When he lands, his cape is all messed up over his tummy. A shot later, the cape is away.
Continuity mistake: When Freddy is hit by the football and falls down, the position of his crutch changes between shots.
Continuity mistake: When Billy and Freddy's conversation at school is over, Billy's hands suddenly swap between being apart to being between Billy's legs and holding the phone.
Continuity mistake: During Billy and Freddy's chat outside the cafeteria, the number of women behind them together alternates between one or two between instant cuts. No continuity whatsoever.
Continuity mistake: When Billy and Freddy talk outside school, Billy's hand holds the phone from the middle part. From the opposite angle he holds the upper part.
Continuity mistake: When Billy interrupts Freddy and Anthea in the cafeteria, her left arm swaps between being raised or not, and back to raised depending on the shot.
Continuity mistake: When Anthea and Freddy are in the cafeteria, a girl in green walks around carrying a backpack while she holds the strap with her right hand. A shot later, the backpack is gone and a cellphone has appeared in her right hand.
Continuity mistake: When Super Hero Freddy shows up at the rooftop, Anthea turns her body around, her right leg bent under the left. A shot later, her right leg is raised and parallel to her left leg.
Continuity mistake: When Billy and Freddie stop discussing outside school, watch the woman behind: One shot she is throwing food in the trashcan, yet a shot later she is cleaning a tray.
Continuity mistake: Billy tells Freddie, "We only have one rule!" while extending his arms. A shot later, they're down by his sides. (00:30:01)
Continuity mistake: Outside school, when Jeffrey drinks from the can, he is either sipping or not depending on the shot; plus, his hand isn't always at the same height. (00:29:50)
Answer: The dinner scene, where Wonder Woman has the head of the Wizard, never happened. There's no indication they knew each other, let alone were friends. In the realm where superheroes actually do exist, there'd really be no reason why she, Superman, who is supposed to know them too, or any other hero wouldn't be there to help. So the only answer would be an unsatisfactory one that sounds pedantic: she didn't help because it's a Shazam movie and not a WW or JL movie. One could say that she and the other heroes were busy with fighting crime/battles in their own city or they didn't know they needed help. She only appears at the end, it seems, to restore the god realm. It's also been said they didn't think Gal Gadot would be available to shoot her cameo scene, so Wonder Woman may not have been in the film because of a scheduling conflict. But to me, if she was meant to be in the film, they would have secured her availability long before shooting.
Bishop73