First, if it's only a "mock" wedding, it does not have any legal ramifications--pretending to do something does not create obligations, convey rights, alter legal relationships, etc. Of course, if the "mock wedding" is actually performed by someone (e.g. a minister) who *can* perform weddings, the participant may find him-  or herself an accidental bigamist, with the liability that entails.The above said, depending on the context, the "mock" wedding can affect a real divorce. If it's performed in a way that is hurtful, insulting, deceptive, etc., it's somethig a judge might take into account during divorce proceedings. On the other hand, if it's purely innocent--a stage play; helping a friend during a rehersal for the friend's wedding; making an informative video about marriage, etc.--it's not likely to have any impact at all.