How many did you already spot?

The episode was about Jo Wilson's abusive ex.

In Season 1, when they first started dating in secret, Derek told Meredith that if he was ever on his last legs, he wanted nothing more than for his sisters to be around him as he died.

Of course, after the Season 11 car crash when Meredith had to take him off life support, she didn't call any of his family before making the decision.

"Absolutely no Bush supporters need apply," it read. Also it's kind of a mindfuck that Grey's has been on TV since the Bush era.

This happened in Season 14, which aired in 2017.

When Mer told Cristina that they were planning to get hitched at City Hall, she gave Meredith an old shopping list on a new sticky note, and let her borrow her favorite pen (which was blue). That sticky note ended up being where Meredith and Derek wrote their vows.

In Season 2, Izzie tried to get rid of Doc the dog by hanging fliers in the hospital. Even though she left the show in Season 6, the poster could still be seen hanging on the wall in Season 12.

She approaches a group of doctors with the line:"You must be the group that's been screwing up the program."

When Meredith gets to rule 3, George, who was repeating his intern year, had to fill in and remind her that the rule is "Dont wake me unless the patient is dying."

Ellen Pompeo, who plays Meredith, confirmed it on Jimmy Kimmel."It was my idea to pay homage to many things and many different seasons and give the audience things to watch out for and to plant Easter eggs," she said.

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22 "Grey's Anatomy" Details That Probably Went Way Over Your Head - BuzzFeed