Express routing returns undefined randomly

I am trying to learn Express with NodeJS and would like to render my views with plain HTML. I hacked together a webserver based on the Express API documentation and several Stack questions, particularly the answer by Andrew Homeyer in this question which states

You can have jade include a plain HTML page:

in views/index.jade

include plain.html in views/plain.html

... and app.js can still just render jade:

res.render(index)

My directory structure looks like this

Project
  *web.js
  Public
      img
      js
      lib
        gallerific
          *jquery.opacityrollover.js
          *jquery.gallerific.js
        angular
      theme
      views
        partials
        *index.html
        *index.jade

and my server looks like this.

var express = require('express'),
    jade = require('jade');

var app = module.exports = express();

app.configure(function(){
    app.set('views', __dirname + '/public/views');
    app.use("/public/lib", express.static(__dirname + "/public/lib"));
    app.use(express.static(__dirname + '/public'));
    app.use(express.bodyParser());
    app.use(express.methodOverride());
    app.set('view engine', 'jade')
    app.use(express.bodyParser());
});


app.get('/', function(req, res) {
    res.render('index');
});

app.get('/partials/:name',  function(req, res){
    var name = req.params.name;
    res.render('/public/partials/' + name);
});

app.get('/public/data/:name',  function(req, res){

    var name = req.params.name;
    res.json('/public/data/' + name)

});

app.listen(3000, function(){
    console.log("Express app listening on port %d in %s mode", this.address().port, app.settings.env);
});

What I am seeing is that certain files fail to load from directories in which everything else loads just fine. For example, my Gallery page fails to load the jquery.gallerific.js javascript file from my lib/gallerific directory while it does load the jquery.opacityrollover.js. I have poked around with Chrome Developer Tools and see the following

I had this site working with the Angular Bootstrap webserver so it doesn't seem to be a javascript error with the client side code. Does anyone know what I might doing that would cause this problem?

The source is available at https://github.com/jamesamuir/express-simple-html.git