1. Instead of just his usual receding hairline, the hair on the right side of face has descended so he appears to be looking only out of his left eye even in the final panel when we can see the right side of his face clearly and still can’t see his eye. The real Michael doesn’t cover his right eye with his hair, but spook Michael does.
2. Michael puts his hand in his pocket and instead of the pocket being near his hip, it is on his side thigh like it was a pair of cargo pants. While cargo pants were first worn in 1938 by British military personnel, they did not become a popular fashion item until the 1990s a few years after this comic strip was published. Clearly spook Michael is actually the ghost of one of those 1938 British military personnel.
I think Michael is the spook.
1. Instead of just his usual receding hairline, the hair on the right side of face has descended so he appears to be looking only out of his left eye even in the final panel when we can see the right side of his face clearly and still can’t see his eye. The real Michael doesn’t cover his right eye with his hair, but spook Michael does.
2. Michael puts his hand in his pocket and instead of the pocket being near his hip, it is on his side thigh like it was a pair of cargo pants. While cargo pants were first worn in 1938 by British military personnel, they did not become a popular fashion item until the 1990s a few years after this comic strip was published. Clearly spook Michael is actually the ghost of one of those 1938 British military personnel.