For static analysis and help to understand IA32 instructions, opcodes, and so on, there is no better reference than the Intel Software Developer's Manual: https://software.intel.com/en-us/download/intel-64-and-ia-32-architectures-sdm-combined-volumes-1-2a-2b-2c-2d-3a-3b-3c-3d-and-4. Besides giving you all of the information you need for each instruction, the opcodes are provided for each instruction. I reference this manual often when static analysis output just doesn't seem to make sense, just like it didn't in the last two bytes of our objdump output in this recipe.