13 details you may have missed on Sunday's 90-minute episode of 'The Walking Dead'

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Warning: There are spoilers ahead.

Negan and a group of his Saviors visited Alexandria on Sunday's 90-minute episode of "The Walking Dead."

While much of the episode pulled straight from the comics — which we'll break down in another post — there were many callbacks to the series going all the way back to season two.

Keep reading to see what you may have missed on Sunday's episode.

Michonne gives a quick look at the nails on the wall at the episode's start.

When the group first arrived at Alexandria, Michonne hammered the nails into the wall and displayed her katana across them in hopes her sword-wielding days were through.

It was a nice, naive dream for a short time. Michonne took the katana off the wall several episodes later after it was used by one of the Alexandrians to kill another.

Michonne started practicing with a rifle on Sunday night's episode.