By Tilt I'm assuming the relative axis difference from our north/south line being perpendicular to the Solar equatorial plane.

The Tilt directly impacts the seasons on Earth by changing how sunlight hits, is absorbed, and deflected by, the earth's surface. Any sudden change in the tilt (setting aside whatever aftereffects that would be felt by the cause of it) would have immediate and more long-term implications.

For the first few days after the change there would be a decrease/increase in temperature as the ground and water cools/heats. This could easily be survived (again save the causation).

In the long-term you'll see mass devastation to the ecosystem, the stopping of oceanic currents while they readjust to the new tilt's heating areas, and likely some earthquakes and other land mass changes (due to the rapid change in temperature). Jet Stream and other wind patterns would likely see a disassembly and eventual re-emergence after the oceanic currents come back together.

For example, if we were to get knocked onto one side, where only the South pole were to face the sun, you'd see Antartica become a desert, as there would be a great deal of light radiation hitting it, and tropical areas in Latitudes just north of there. What is now the equator would be much like either pole is now: a frozen or near frozen wasteland due to little or no sunlight reaching these areas. Anything north would be permafrosted and eventually snowcapped.

You can toy around with the axis angles and get different results, but sometimes the extreme helps answer the question.

The tilt has nothing to do with the magnetic field that I am aware of. If we changed suddenly then the magnetic North would still be where its at, as it would take the entire planet being shifted in order to change the tilt. I suppose we might have to change the name for it to the East by Northeast pole...but that's about all the worst I see happening as far as pole shifting in regards to tilt change.