Mary dropped a bracelet when they heard the sirens and started to run.

The man on police costume has a tag on his left arm; it says "Salem Police", has a drawing of the shadow of a witch on a broom and says 1693 next to it.

When Sarah comes back home, after luring the children, flying on the mop, you can see under her dress a short jean and if you watch carefully you'll notice that the person on the mop seems to be someone else.

When the Witches come into the 20th century they seem to think like it is still the 17th century, but later in the movie Winifred knows about drivers permits. How did she figure that out?