I am not buying into the conspiracy theories, but this article points out some interesting inconsistencies in the reporting concerning the Sandy Hook/Newtown shooting.
Certainly, it wouldn't be the first time that the media and/or authorities failed to report critical information. For instance, I've never seen domestic news sources describe the Trolley Square shooter's Muslim background (see, e.g., here), nor explore the possibility that it was an Islamic terrorist incident. Similarly, the government still obtusely ignores the obvious Muslim motivations of Nidal Hasan's shooting at Fort Hood.
Returning to the Sandy Hook shooting, I had previously noted reports of a possible accomplice being arrested in woods near the school. However, there has been no follow up by media that I've been able to find that identified the person or what happened to him.
Early reports also indicated that an AR-15 rifle was found in the trunk of the shooter's vehicle or inside the school. Several sites have pointed to video of police recovering a long arm from the trunk of the shooter's vehicle as proof that the AR was in the trunk. However, in looking at the video of police removing a firearm from the trunk of the vehicle (see here and here), it is obviously a shotgun that the police are handling.