In the 'shooting the TV' scene several characters blaze away with an assortment of automatic and semi-automatic weapons. But, with the exception of an MP 40, no empty cartridges are seen to be ejected.
On leaving the Council House to go to Gas Street, Tim/Cliff correctly turns right (westwards) but then he is next shown walking along New Street which is in the wrong direction (south east) away from the Council House. He then follows a route which jumps rather randomly around the city centre before finally arriving at Gas Street.
Tim/Cliff folds a map of Birmingham into neat quarters, and then sees Gas Street is located almost in the centre of the map where the folds cross. However Gas Street is located well to the west of the city centre and beyond the (former) inner Ring Road so hardly likely to be in the map centre.