Glitch! (1988)

"It's all about breaking in, breaking through, and breaking even!"

Two thieves rob a large fancy house when the owner is away. But when a visitor mistakes them for the owner, and they find out about a casting party mis-scheduled for that day, they decide to stick around for the fun. There's only one small problem, a little glitch in their plan. The real owners owe some bad dudes a lot of money, and they show up to collect.