Did Bezos know about Shatner's alcohol problems? I watched more Star Trek than most, but I had no idea before this comment, and I have even less of an idea about his wife. Not everyone is clued up on the latest celebrity gossip.
Basic hospitality is important. Most folks are rightfully indignant when an interviewing company haven't read their resume, while virtually all companies want interviewees to have read the company public website.
People are not props.
Akin to giving a Chinese guest a watch and white flowers as a present - sure, he might not know that it's a faux pas [1], but he should have structures in place to prevent basic slip-ups.
[1] both associated with death/funeral