If you are referring to the fact that the LL seen Lucas on the 16th possibly being mistaken, I don't think so. For one, our VI's have continuously told us that this is true. Also, while it could be possible for someone, like the LL, to get dates wrong, I don't think that is likely in this instance. EG had only been living at that house for 9 days on Feb. 16th. If they moved in on the 7th, which was a Wednesday, there would only be two Fridays to choose from, both would be days that someone would remember. For example, the first Friday, which was the 9th of Feb. would be memorable because it was immediately after they moved in. The next Friday is the only other Friday that they lived in the house and it was the day before Lucas came up missing. Logically it doesn't make sense for the LL to mix the days up unless the guy has Alzheimer's. So I think it's safe to say that there is a less then 24 hour time period for Lucas's disappearance.
As for Valentine's day, I wonder if EG dropped Lucas off at the park by himself? Maybe that's where the tip came from? Maybe someone remembered seeing Lucas at the park that day and called it in. I don't put it past EG to do something like that.