Let me first say that I am not a UCD graduate, and I can't really speak as to what connections or opportunities a UCD LL.M will offer internationally. You may want to direct your questions to UCD, and ask them about the post-graduation employment outlook for their international students.
To a large extent, I think the answer to your question depends on whether you plan to rely on the prestige of your degree to obtain employment internationally, or whether the LL.M is simply a means to qualify for taking the California bar exam. Like I said above, UCD is a well respected school in California. Internationally, however, I don't know how recognizable it is. I would suggest trying to contact graduates of the program as well as UCD and ask about their experiences.
As far as getting hired at a large U.S. firm, undertsand that hiring is very, very competitive. The entertainment industry in particular is highly competitive. Top UCD graduates do get hired at big California firms, but the prospects for a foreign applicant with a U.S. LL.M may be different. It may be more difficult to get hired, especially if there are any visa/immigration issues. Again, I'd contact Davis and ask them directly about how many of their foreign LL.M grads were hired by U.S. firms.