Yes, the "Did you spot the gorilla?" refers to a famous psychological experiment demonstrating inattentional blindness. In the experiment, participants watch a video of two basketball teams passing a ball and are asked to count the passes of the team in white. During the video, a person in a gorilla suit walks through the scene, thumps its chest, and then leaves. Remarkably, about half of the people watching the video do not notice the gorilla at all because they are so focused on counting the passes. This illustrates how people can miss even very obvious and unusual things when their attention is occupied with another task.
So, "spotting the gorilla" is a metaphor for being aware of obvious things that people often overlook due to focused attention elsewhere.