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When trying out dis.dis on some synthetically long functions, I noted that spurious branch targets were being generated in the output. First one is at address 8:
157 0 LOAD_CONST 1 (1)
 3 DUP_TOP
 4 STORE_FAST 0 (z)
 7 DUP_TOP
 >> 8 STORE_FAST 1 (a)
 11 DUP_TOP
I dug into findlabels and notices that it pays no attention to EXTENDED_ARG. The fix is pretty simple, basically copy pasta from dis._get_instructions_bytes, at line 369, in the 3.5.1 release code add all the "extended_arg" bits:
 extended_arg = 0
 while i < n:
 op = code[i]
 i = i+1
 if op >= HAVE_ARGUMENT:
 arg = code[i] + code[i+1]*256 + extended_arg
 extended_arg = 0
 i = i+2
 if op == EXTENDED_ARG:
 extended_arg = arg*65536
 label = -1