Examining the posted schematic, PCB layout, and parts list for the Word Clock at Instructables, there appear to be several inconsistencies.  I believe that this is due to the fact that the project was revised a few times after the schematic was drawn. Improvements

• It should be possible to swap out the PIC16F877 that Doug used for a PIC16F887, which has the same pinouts, with minimal changes to the code, should you decide to rebuild his clock without any modifications aside from upgrading the microcontroller.  And added benefit of using the 887 versus the 877 is that the 887 has a built-in oscillator with a default frequency of 4MHz, so an external oscillator is no longer needed.

Inconsistencies

• The parts list supplied by Doug lists the power regulator as a 78L05, whereas the outline on the PCB layout is for an LM7805.

I had a few other things in mind, but I originally drafted this post a while ago, and now no longer remember what else I was going to write.