Replaced Accord timing belt

96 Accord EX (4cyl) 5-speed 170,000mi. Yesterday, I had it in the shop to get the timing belt replaced. He also replaced the balance shaft belt and the two belts that run alternator, ac compressor, etc.

When I picked it up, it runs fine, accelerates fine. The idle might be a bit faster than before (not sure), but the engine sounds louder. It sounds like it could just be an exhaust leak, but what are the chances of developing a leak while at the shop? Also, there is a slight vibration in the gas pedal and the steering wheel. Could the timing belt or balance shaft belt be off a little to cause this? Have driven about 40 miles and no check engine light.