  In this paper, we investigate analytic and geometric properties of
obstruction flatness of strongly pseudoconvex CR hypersurfaces of dimension
$2n-1$. Our first two results concern local aspects. Theorem 3.2 asserts that
any strongly pseudoconvex CR hypersurface $M\subset \mathbb{C}^n$ can be
osculated at a given point $p\in M$ by an obstruction flat one up to order
$2n+4$ generally and $2n+5$ if and only if $p$ is an obstruction flat point. In
Theorem 4.1, we show that locally there are non-spherical but obstruction flat
CR hypersurfaces with transverse symmetry for $n=2$. The final main result in
this paper concerns the existence of obstruction flat points on compact,
strongly pseudoconvex, 3-dimensional CR hypersurfaces. Theorem 5.1 asserts that
the unit sphere in a negative line bundle over a Riemann surface $X$ always has
at least one circle of obstruction flat points.
