They are both titles of episodes of a television series - "Jessie". They are not proper phrases. A writer will often make up a title that sounds nice or is 'a play on words', but doesn't mean anything at all. - "Evil Times Two" is meant to refer to a mean nanny with an identical twin. The twin is mean/evil, too. In other words, evil twice. - The plot of "Pain in the Rear Window" involves a character injuring his knee. It also refers to an old film by Alfred Hitchcock called "Rear Window". If you look up the plot of this episode and the film, you will find they are similar.

They are both titles of episodes of a television series - "Jessie". They are not proper phrases. A writer will often make up a title that sounds nice or is 'a play on words', but doesn't mean anything at all. - "Evil Times Two" is meant to refer to a mean nanny with an identical twin. The twin is mean/evil, too. In other words, evil twice. - The plot of "Pain in the Rear Window" involves a character injuring his knee. It also refers to an old film by Alfred Hitchcock called "Rear Window". If you look up the plot of this episode and the film, you will find they are similar.