The poster◊ for the film is plenty scary, showing an orca facing front on a black background. The only color bright enough to see is the large white patches that resemble eyes at the front of his head. All that's shown is the orca, the film's title, the Sundance Official Selection emblem, and "coming soon". Nothing more, nothing less.
The opening credits. We see whales swimming with trainers, with 911 calls from various parks about whales attacking trainers playing over it.