Baby Groot, who acts and resembles a toddler, is tortured by Taserface and his other Ravengers, including being put in a cage and getting drinks thrown on him, while being surrounded and yelled at.
Peter's father, Ego, killed hundreds if not thousands of his own children when they failed to manifest his godlike powers. When Peter shows promise but refuses to join Ego, the latter tries to keep Peter imprisoned as a living battery to punish him.
Ego gaslights Peter through the majority of the film to become all-powerful like him, hiding the fact that he killed hundreds of children that weren't like Peter and also just barely letting the fact that he killed Peter's mother slip out.
Nebula breaks a lot of bones after crashing her ship and then fixes them herself after. There is no blood but there are many things hanging at odd angles.
Drax makes retching noises at around 1:21:35 played for comedic effect, Drax does not actually get sick. Baby Groot throws up at around 1:24:23 with visuals and sound.
Drax jumps directly into the Obelisk's mouth and it swallows him whole. He attempts to kill it from the inside, but it doesn't work. Gamora cuts him out of it after it has died.
At 37 minutes 30 seconds darts are shot at the antagonist characters and a close up of the needles on the darts are shown in slow motion before hitting the targets and being shown stuck into their faces
When Baby Groot is being crushed by rocks, he tries his best to get out for a second or two but it is hopeless, so he makes this really sad face and bursts into tears with the exact sound of a crying baby. It’s a quick clip but extremely upsetting, especially if you already are very attached to the character. I started sobbing immediately when I heard it.
Drax tells Mantis several times how ugly she is, and finally says that she is "beautiful ... inside". Not hate speech, per se, but I don't know where else to put this!
Able actors play disabled characters, although their prosthetics are sci-fi in nature. BIPOC actors were only cast in roles where they play extraterrestrials.
Yondu's first scene in the movie is shown half naked, presumably just having finished with a hooker bot that the planet he's on is known for. Mantis also mentions that Peter has a "romantic, sexual love" for Gamora, though this is played more as a joke.