There are few things that are worse for a homeowner than issues that can’t easily be seen with the naked eye. While wallpaper is something that some prefer to have on their walls, they are also notorious for hiding things behind them that can prove to be an issue. There are even some unscrupulous sellers that will use it to cover something up on purpose. It might not be possible to see holes, cracks, and water damage when a room has been covered up with wallpaper.
If it seems like wallpaper has been recently added to a home, it is definitely worth taking a closer look. Feeling the surface of the walls, you might be able to tell if there are irregularities underneath. Temperature differences could also indicate an issue underneath. A good home inspector will be able to tell you more using the tools and experience that he brings to the table.