At one point during the Amsterdam boat chase, the white boat hits a bridge and sustains fairly severe damage to the prow (which is acknowledged in the sound effects). In the next shot, the boat is unblemished again.
The co-ordinates in the notebook are written as 52° . 35' . 16".1 N / -0.5° . 27' . 19".5 E. This is badly formatted, even allowing for the European use of period and comma being the opposite way round to UK and US convention (ie they use a comma as a decimal point and a period as a field separator). Also the minus sign in conjunction with "E" is redundant: a negative coordinate implies west (longitude) or south (latitude) of Greenwich, in which case compass directions such as N (north) and E (east) are not used. However if these errors are ignored and the coordinates are interpreted as 52º 35' 16.1" N, 0.5º 27' 19.5" E, they point to a location in the Markermeer, east of Amsterdam and north of Lelystad - roughly where Paul Sherman draws a cross on the map.
In a stunt shot during a fight on a dockside, as one crook is thrown into the water, one of the recovery diver's bright yellow air tanks is visible just below the water surface.
In the first scene in the film you see the shadow of the camera crew.