The nominations for the 2021 Screen Actors Guild Awards were announced Thursday by Lily Collins (Golden Globe-nominated for “Emily in Paris”) and Daveed Diggs (“Snowpiercer”) on @sagawards’ Instagram after a buggy and awkward start. The star of stars of the day: The late Chadwick Boseman. Diggs had a moment of delighted surprise when his co-host announced he had been nominated for the award for an actor in a limited series or television movie for “Hamilton” (sadly, he was unable to reciprocate the laurels for Collins, as her show “Emily in Paris” was shut out in the noms, as was her film “Mank” — except for lead Gary Oldman — in one of the bigger snubs and surprises of the morning). Diggs’ was the only nod for “Hamilton,” though his fellow Tony winner for the Broadway version, Leslie Odom Jr., did receive a SAG nomination for his supporting work in “One Night in Miami.”