Shortly after Will Randall told Laura Alden about what happened to him with the wolf two days before during the full moon, there is a view of the moon. But the moon is already only half full and, moreover, the moon is in the growing phase.
The rearing stallion at Raymond's is two different horses. When Will walks up to Raymond's horses, the prize dark bay stallion, with just a white star on his forehead and a white snip on his nose, rears up. When the camera moves back to the side shot of the rearing horse, it is now a red sorrel color with a full wide white blaze extending all the way from his forehead to his nose. Then when the camera returns to the next shot, it is the dark bay horse again.
Shortly after Will hits the wolf, we see the Volvo's front steady parking light. As he exits the car and shuts the door, the light is now blinking. When he continues walking towards the wolf, the light has once again become steady.
When Will hits the wolf with his car, the shot clearly shows the wolf being hit fully and squarely with the front bumper of the vehicle, which would have thrown the animal forward or caused the car to run over it. In the next shot, the wolf is squarely hitting the windshield.
In the opening sequence, when Will is driving his Volvo, the sun is setting and the full moon is rising in the same part of the sky. The moon should be black, or be rising on the opposite side of the sun.
When Will calls Laura to apologize and explain his running off the previous morning, he complains that he can hear her toweling her hair. This is supposed to illustrate his heightened perceptions.
The trouble is, that telephones of the kind used in the film, purposely limit the audio frequencies they pass back and forth, to a narrow range in the human vocal spectrum, in order to reduce interference. Even with superhuman hearing, Will would not be able to hear sounds that were blocked from transmission.
After he becomes a wolf, Will's hearing is super-sensitive. But when Stewart is behind Will with hedge clippers, he snips them, then growls, and Will doesn't hear it (which is why Laura has to shoot Stewart instead).