When Captain Olivia Benson has her hallucination that Detective Elliot Stabler is part of the ambulance crew rescuing her, he's wearing the beard he grew for his undercover assignment on Law & Order: Organized Crime (2021). However, Benson could not have hallucinated Stabler with a beard because she hadn't seen him with it yet. In fact, she had just had seen Elliot at the wedding in the previous episode and he was clearly clean shaven.