Ok, so for those curious minds out there this is what I found:
Miscellaneous Parts in the sales order was a total of $89.82.
But in the Estimate from QL, Misc. Parts was listed as Qty: 1, Cost 0; Markup 1; Total $1.00;
Also, the prices of the three items mentioned in previous post were altered somehow in QL, so they didn't reflect the correct price.
All total, there was $753.67 difference between the two (sales order and estimate from QuickLinks).
Of that amount, $371.52 was in missing labor, the rest was parts and the sales tax associated with those parts.