- John Slattery is one of three actors to portray Howard Stark, along with Gerard Sanders and Dominic Cooper.
- John Slattery previously worked with Anthony Mackie in The Adjustment Bureau.
- John Slattery worked again with Corey Stoll in The Romanoffs.
- John Slattery previously worked with Mark Ruffalo in Spotlight.
- John Slattery shares his birthday with Sebastian Stan and Eme Ikwuakor.
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