lucid dream shots were filmed on a sound stage at Raleigh Studios, using green-screen effects for the backgrounds. These scenes were to play on the Third man factor, bringing in people from Rick's past that would help keep him moving as he struggled with his blood loss. This led to some discussion about whom to bring back for these shots between Kang and writers Scott Gimple and Matt Negrete, needed characters that were essential to Rick. Shane, as played by Jon Bernthal, was considered essential given Shane's impact on Rick's story throughout the show. Hershel as played by Scott Wilson was seen as a father-figure to Rick, and Sasha as played by Sonequa Martin-Green was seen as a soldier who knew how to put the bigger picture first in her priorities. They had considered bringing back others like Steven Yeun who played Glenn, but there were scheduling conflicts, and the production felt the three guests they had worked strongest for the story. This ended up being Wilson's last on-screen role before his death; on the day that they announced that Bernthal, Wilson, and Martin-Green would return in guest roles for this episode during the 2018 New York Comic Con in October 2018, Wilson died from complications from leukemia. Additionally, former The Walking Dead actors Lennie James, Sarah Wayne Callies, Emily Kinney, and Michael Cudlitz all provided voice-line cameos as their former characters Morgan Jones, Lori Grimes, Beth Greene, and Abraham Ford respectively as part of Rick's lucid dreams. The shot of Rick walking among the bodies of those he knew include a mix of his fellow actors, body doubles of former characters, and dummies for other characters. The scene itself was inspired by one of the special covers for issue #100 of the comic book, where Glenn is killed by Negan. This scene was originally to have some of the bodies rise up to make it more harrowing towards Rick, including Negan, but this was ultimately cut. Kang stated they felt that Shane served well-enough as an antagonizing character to Rick but had a friendship and connection with him, while Negan's hostility would have been more direct. The final scenes shot for the episode involved the hospital setting where Rick first woke up in the pilot episode "Days Gone Bye", though with small changes. To further bookend Rick's arc, they reused the song "Space Junk" by Wang Chung which was