It's shocking that Telltale made a point and click adventure game where you can't point and click. That's right, on PC, you have to steer your character around using the keyboard!
Another issue is the flakiness of the brackets that show up when mousing over an interactable object; sometimes the brackets show, and sometimes they don't. They're a bit slow to pop up which means you can miss an important object entirely if you move the cursor too fast. Finally, the area that triggers the display of the brackets is sometimes just a portion of the area they enclose.
And finally, Wallace & Gromit suffers from the constrained camera that plagues all of Telltale's releases to date. All camera positions and angles are preset; you have no control over the camera or when cameras change. This interferes with exploring and understanding the game environment, and the sudden camera switches can be frustrating. Games aren't television, and Telltale should stop trying to make them like television. At the very least, allow a free camera option for more advanced players.