80's movie logos

While I was at home I came across a rather strange anomaly of film promotion…

I am, for those that don't know, a bit of a fan of 80s teen movies - heck, I'm a bit of a fan of the 1980s in general, although I only lived through 6 years of it…  John Hughes is obviously a huge part of this obsession, and will be sorely missed.  So in my old bedroom in the house where I grew up, I have a couple of posters of movies of his, both of which have accompanying logos.  By logos, I'm not simply referring to the typeface of the movie title or the way in which it is displayed.  I'm talking about separate, stylised logos, which I can only imagine were made to further promote the movies in the years of their release.  Here's a closer look:

From the 1985 movie 'The Breakfast Club', a circular logo beneath the title typeface:

…and from the 1986 classic on which I base my life 'Ferris Bueller's Day Off', this rather more inconspicuous logo (possibly based on Robert Indiana's 'LOVE' sculpture) in the lower-right corner:

…and again, in for a closer look:

I've searched online for any information relating to these logos but as yet have found nothing.  If anyone reading this has any information, I'd be interested to find out more about the ideas behind giving the films a logo.  Was it something that was utilised during the original release period?  An instantly recognisable moniker alerting kids to the new Hughes hot property?  Answers on a Molly Ringwald postcard, please…