When Henry enters Café Diem after everything has turned to gold, we see digital police tape and emitters, yet when Henry, Jo, and Jack rush out of Café Diem, the digital tape and its emitters are missing outside.
At Cafe Diem, when Zoe talks about "compromising virtue," she rests her chin on her right hand, but when the angle changes for Jo's reaction, Zoe's right arm is laying on the counter, her hand dangling over the edge.
When viewing the statue for the first time after it has turned to gold, you can see a sign for Home Hardware, a Canadian Hardware store chain.
The bacteria causes metal to turn to gold, then rust, and disintegrate, but the beams in the foundation are all still steel while only the concrete is breaking apart and collapsing. If the bacteria were the cause the foundation beams should be gold and rust and they should be bringing down the concrete.
When Jack walks into his work area, Dactylos is making sparks with a MIG welder, holding the electrode end several inches above his work. The actual use of a MIG welder involves holding the electrode end about half an inch above the work surface so that gas can flow around the arc to prevent oxidation of the deposited metal.