I'm willing to give them some leeway with this, except they also forgot that CL also searched that same night for him when he didn't return.I keep thinking about that. The only thing I can think of is that they knew which day, but got the date wrong initially. I work at home. Often it's Wednesday and I think it's Tuesday or Thursday, and I have no idea what date it is if I haven't had to pay attention to the date the past few days. Granted, you'd think they would have been accurate when reporting him missing, though.
Initially CL and RL reported BL missing and said they weren't concerned for the first 24-48 hours, that's when they went to the park and located his car. There was never an initial mention of CL going the same night to look for him.
It could seriously be nothing, but something about that story has always bothered me.