Schematic just says 33 ....... parts list says 33E.
But all the resistors in the parts list are designated with the "E" aside from the particular "K" resistors which match the schematic. Such as 2K, 10K, 20K, etc.
So my best assumption would be that 33e is nothing more than a 33Ohm resistor.
(1/2 watt, 5% tolerance and all that of course)