Woman: What's it gonna cost? (Green Lantern flies away in a huff) Woman: And how am I supposed to get down from here now?
Conveniently Empty Building: Dozens of them, except for that one with someone visibly fleeing inside it when Superman plowed through it...
Conservation of Ninjutsu: One Parademon was handling Batman and Green Lantern. Another seemed to give Superman a decent fight (though he may have been holding back to try to capture it alive). Once the Mother Boxes open, they go down in droves.
Go for the Eye: Wonder Woman comes up with a rather direct solution to Darkseid's Omega Beams: blind him.
Hero Insurance: A protester rants about the heroes causing $100 million in damage yearly as part of the reason they need to go. Such an estimate is rather tame by modern standards, all things considered.
Hero with Bad Publicity: The heroes aren't well-liked to begin with, in part because of the massive collateral damage they cause; aside from the Flash, most of them can't be bothered to check themselves. An alien invasion warms the public to them.
Hoist by His Own Petard: What ultimately stops Darkseid is Cyborg, who has a combination of Apokaliptian technology and other alien tech which allows him to interface with the Mother Box and reprogram it to send Darkseid and his army back where they came from.
Human Resources: Parademons are created by re-purposing the local populations of the planets Darkseid conquers.
Batman: "No, he won't. You bruise, but you don't kill. Do you... Clark?"
Superman: (Goes wide-eyed with surprise, then comes to a halt right in front of Batman) "You've made your point..."
Impossible Thief: Batman manages to steal Hal's ring while he's wearing it, and Hal doesn't notice until Batman holds the ring up to study it.
Jerk Jock: Superman acts during most of the movie like one.
Large Ham: Wonder Woman is very... exuberant, especially when it comes to battle. Even outside of fighting, she seems to approach near every situation with the same warrior's boisterousness. Even eating ice cream.
Green Lantern doesn't really think before he attacks. Amusingly, by the end of the plot he manages to shape up and puts together a careful plan of attack, only for Shazam to ruin it by doing this instead - which Lantern lampshades.
As mentioned above, another example is Shazam (and Diana calls him out on it), though he has the excuse of being a kid.
Ironically enough, Diana herself doesn't really stop to think before she decides to attack Cyborg upon first meeting... and gets a face of automated sonic cannon for her troubles. Immediately after, Flash lets everyone know Vic's on their side.
Small Name, Big Ego: Played with by Green Lantern. He's perfectly correct when he tells Batman that this whole star sector is his jurisdiction... but then he goes and quickly gets taken down a peg almost constantly.
Shazam is a milder example. He naturally assumes he can take Darkseid by himself and wrongly believes Wonder Woman "digs" him.
Smug Super: Green Lantern, Wonder Woman, Superman, and Shazam. Superman, Shazam, and Green Lantern all think they can handle most threats on their own and rely on their powers. Superman even toys with Batman and Green Lantern when they first meet, knowing there's nothing they can really do to him. Superman's first interaction with WW is just saying "you're strong" and she says "I know."
Even Batman is smug and he has no powers to be smug about, he swipes Green Lantern's power ring and when told he's not going to do it again, his reply is "Unless I want to."
Superman Stays Out of Gotham: Averted with GL coming to Gotham. As far as GL's concerned, Gotham is part of his jurisdiction anyway. Otherwise, it seems pretty clear that each hero has his own jurisdiction that he didn't stray from until the events of the movie.
Taking You with Me: The first Parademon being tracked by Green Lantern and Batman tries to blow itself up with them.
Darkseid tries to take Superman with him as he's being sucked into the Boom Tube.
Tempting Fate: Basically every time someone says something like "What can possibly go wrong?", things get worse.
Too Dumb to Live: Victor. His transformation is a result of grabbing a visibly glowing alien box while it's being studied by his father.
Unwilling Roboticization: The means in which Parademons are created involves subjected captured bystanders to this, to a horrifying extent. Victor's transformation into Cyborg's partially involves undergoing the same process, but he keeps his sense of self.
What Measure Is a Mook?: It's established early on that the Parademons are mindless foot-soldiers, so the heroes cut them down in droves. Even after it's revealed that they were innocents converted to become Parademons, no one bats an eye about slaughtering them in droves. In fairness, they don't really give the heroes any chance to discuss terms of surrender...
When All You Have Is a Hammer: Or in this case, when all you have is a sword. Wonder Woman needs little provocation to use her sword. This includes ordering ice cream and thanking the vendor.