YOU ARE SUPER HERO  !!!! 
How can us mere mortals help?

challenge

• weird wall causes false positives

possible solutions

• move camera or wall :D
• add preFilters to reduce size, and other filters which will reduce impact of wall - size reduction will increase speed of search too

challenge

• multiple faces causes camera to go crazy

possible solutions

• is it really multiple faces ?  right now the default face detect filter is searching for the first & biggest face - this was one of Ravers optimziations - it is quicker than searching for multiple faces.  Maybe the problem is the biggest face switches from one face to another (e.g. gets closer or farther away)?
• can you switch cascades ?   I found that the haar_cascade_mcs_eyepair_small.xml was less prone to false triggering.

  

  Please video or post pictures of the problem .. it will allow us to help more !
  What has happened.. what are the good things? What are the things which need improving ?
  You are ambadassadors - what is the news ?
  You & Your GF ROCK !