Peter affecting Hook's voice (Dramatic Irony)
At the lagoon, Peter affects Captain Hook's speaking voice as a way of tricking the pirates into letting Tiger Lily go. While the reader/viewer knows that it is Peter pretending to be Captain Hook, the pirates believe that it is actually their leader giving the order, which creates an instance of dramatic irony.
Tinker Bell telling the Lost Boys to shoot Wendy (Dramatic Irony)
When Wendy and her brothers are first flying into Never Land, Tinker Bell tells the Lost Boys to shoot Wendy, telling them that she is actually a bird that they ought to hunt. While the reader knows that Wendy is not a bird, and that Peter would not approve of Tootles shooting her, the Lost Boys have no idea.
The pirates beating the tom-tom (Dramatic Irony)
After the pirates defeat the Indians outside of Peter Pan's lair, they beat the tom-tom, an Indian drum, to mislead Peter and the Lost Boys into thinking that the Indians have won. It is this dramatic irony—the fact that Peter and the Lost Boys have no idea the pirates are waiting outside—that lead to Wendy and the boys getting kidnapped.
Peter making the ticking noise (Dramatic Irony)
When Peter Pan arrives on the Jolly Roger to rescue Wendy and the Lost Boys, he goes in the cabin and makes a ticking noise to pretend that he is the crocodile who is pursuing Captain Hook. This causes all of the pirates to cower in fear, and Hook sends pirates into the room one by one to face the crocodile. While the reader knows that it is Peter making the sound, the pirates have no idea and believe it is the actual crocodile.