1)
http://imageshack.us/photo/my-images/541/rlv7.jpg
Invisible barrier makes you unable to jump on stairs from the upper floor in the visitable London's house.
2)
http://imageshack.us/photo/my-images/543/c3em.jpg
Graphical glitch that makes water not covered by the smoke
3) Fall and die here:
http://imageshack.us/photo/my-images/853/xc7x.jpg
Respawn here:
http://imageshack.us/photo/my-images/826/t2gd.jpg
Checkpoint bug! In the part where you have to dry out the flood, a part of the footbridge you walk on actually falls into the water, and then you get attacked by water-monsters. If you die here, you will respawn after the fallen footbridge without the necessity to escape anymore from the monsters.
Sorry for the freaking gamma-low pics