Welcome to the forum, aestar32.
Well, yes, it's possible that the knife Peter holds is symbolic of the betrayal to come.
Someone else mentioned the glasses and glass 'carafe'. I hadn't noticed them 'til then, but I don't think that any of these look as if they are important enough to be the holy grail.
If you look through this section, you will find lots of threads where these and other subjects are discussed. You might find them interesting.
Having read your comments about your beliefs, I think that you might enjoy reading the threads in the Religious Research section too.
We even have a thread on Santa Claus.
If you go to the list of topics for each subject area you will see, at the top, 'show topics from the last .. days'. You can change this so that you can see more topics or even all topics.
Have a look ~ see what you think.