To my knowledge, Toyota floor mats in recent years have not just one, but TWO hooks to make sure they won't get bunched up under the gas pedal.
Before the "stuck gas pedal" thing that prompted Ray LaHood to rashly advise Toyota owners to park their cars because they were "unsafe", the NHTSA did not bother to respond to complaints until the total number of complaints went over 1,000.
Anybody can file a complaint, and anybody does. The NHTSA set the 1,000 threshold based on the realization that, on investigation, most complaints are found to be groundless, or to have to do with the operator rather than the vehicle.
Note that the article states that the NHTSA knows of 97 complaints. Until very recently, 97 complaints would have been 903 complaints short of an investigation. Toyota was fined for, apparently, not responding quickly enough. However, the NHTSA requires automakers to report once they become aware of a systemic problem, and there's where things get very gray: When does Toyota's knowledge graduate from acknowledgement of a few incidents to awareness of a systemic problem? At one time it took a thousand. Now it takes...? Somebody's arbitrary opinion? I suspect this latest fine has little to do with safety.