No. You can just show up for the second one, but you still pay the same price. They typically post the start time of the second movie as well.
You have heard from the horse's mouth.
I'm the co-owner of the Cinema Theater. You are certainly welcome to come just for the second movie (and lots of people do), but the ticket price is the same as for the double feature -- $7 adults, and $5 seniors/students. We rarely sell out, so you're almost guaranteed a seat.
They are reasonable. I'm sure they will sell you a ticket at the double feature price if there is seating available when you arrive.
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