Rule 630 OffSide

The puck is deliberately shot directly on goal by an attacking player in the Neutral Zone with a teammate clearly positioned in the Attacking Zone. What is the proper ruling?

Intentional offside. Rule Reference 630(c).

There was no effort to create a legal play at the blue line in order to be onside.

Rule 407 Goalkeeper Penalties

A goalkeeper is assessed a minor penalty for slashing. They proceed to verbally abuse the Referee and is assessed a minor penalty for unsportsmanlike conduct. They continue the abuse and is assessed a misconduct penalty for continued abuse. Who serves the penalties for the goalkeeper?

A player on the ice at the time of the infraction shall serve all of the penalties. Rule References 407(a).

The team will also need to place an additional player on the penalty bench immediately who shall serve the minor penalties and return to the ice upon their expiration

 Rule 636 Start of Game and Time of Game/ Time-Outs

Should the On-Ice Officials blow the whistle at the end of a period?

Yes. Rule Reference 636(a).

In the three-official system, it is the responsibility of the Linesman who is on the opposite side of the ice as the Referee to skate into the Attacking Zone to the goal line to assist the Referee. The other Linesman watches the clock and blows the whistle the instant time expires. The horn may not always be in working order.
In the two-official system, the Referee on the blue line shall be responsible for blowing the whistle the instant time expires